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IgorC [24]
3 years ago
7

Hᴇʟʟᴏ Bʀᴀɪɴʟɪᴀɴs ¡!

Mathematics
1 answer:
Mashutka [201]3 years ago
4 0

Answer:

volume: 49280 cm³  and   curved S.A = 5826.64 cm²

Explanation:

  • height of smaller cone: h₂
  • radius of smaller cone: 7
  • height of bigger cone: 45 + h₂
  • radius of bigger cone: 28

using similarities:

\sf \frac{45 + h2}{28}  = \frac{h2}{7}

\sf 315 + 7h2 = 28h2

\sf 315  = 28h2-7h2

\sf 315  = 21h2

\sf 15 = h2

total height of the cone: 45 + 15 = 60 cm

solve for volume:

\sf volume \ of  \ cone  \ = \frac{1}{3} \pi r^2 h

\sf volume \ of  \ cone  \ = \frac{1}{3} \pi (28)^2 (60)

\sf volume \ of  \ cone  \ = 15680\ *\frac{22}{7}

\sf volume \ of  \ cone  \ =  49280 \ cm^3

First find the slant height using Pythagoras theorem -

\sf l^2 = r^2 + h^2

\sf l =\sqrt{ r^2 + h^2}

\sf l =\sqrt{ (28)^2 + (60)^2}

\sf l =66.212 \ cm

solve for curved surface area:

\sf curved  \ surface \  area = \pi rl

\sf curved  \ surface \  area = \pi (28)(66.2)

\sf curved  \ surface \  area =5826.64 \ cm^2

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